Islam is a mono theistic and Abrahamic religion articulated by the Qur'an, a religious text considered by its adherents to be the verbatim word of God (Allāh), and, for the vast majority of adherents, by the teachings and normative example (called the sunnah, composed of accounts called hadith) of Muhammad .An adherent of Islam is called a Muslim . Muslims believe that God is one and incomparable and that the purpose of existence is to worship God. Nearly all Muslims consider Muhammad to be the last prophet of God.